Arnold-Chiari malformation MRI

Arnold-Chiari malformation Microchapters
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Editor-In-Chief: C. Michael Gibson, M.S., M.D. [1]

MRI

• MRI is the imaging modality of choice to evaluate for a Chiari I malformation. MRI findings:
  • Cerebellar tonsillar herniation
  • Wedge shaped tonsils
  • Syringohydromyelia
  • Small posterior fossa
  • Obstructive hydrocephalus
  • Brainstem anomalies
• Tonsillar displacement is measured from the basion-opisthion line on a sigittal image.
• Herniation is usually at least 5mm, though patients with 3-5mm herniation may also have the malformation.
• MRI CSF flow studies may prove to be helpful and are currently under investigation.

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  Sag T2
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  Sag T1
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  Sag T1
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  Sag T1
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  Sag T2
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  Ax T2
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  Ax T2
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  Ax T2
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  Brain: Arnold Chiari I; T1 (MRI)
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  Brain: Arnold Chiari I, with Hydromyelia of Cervical Spinal Cord; T1 (MRI)
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  Brain: Arnold Chiari II, with Towering of The Cerebellum and Wide Tentorial Incisure; T1 (MRI)
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  Brain: Arnold Chiari II, with Fenestrated Falx Cerebri and Interdigitating Gyri; T2 (MRI)
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  Brain: Arnold Chiari II, with Tectal Beaking and Large Massa Intermedia and Stenogyria; T1 (MRI)
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  Brain: Arnold Chiari Type II with Medullary Spur and Kink (MRI)
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  Brain: Arnold Chiari II, with Hypoplastic Corpus Callosum; T1 (MRI)
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  Brain: Arnold Chiari II, with Cerebellar Hemispheres that Creep Anteriorly Around the Brain Stem; T1 (MRI)
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  BRAIN: ARNOLD CHIARI II (MRI)
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  BRAIN: ARNOLD CHIARI II WITH ELONGATED FOURTH VENTRICLES AND STENOGYRIA; T1 (MRI)
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  BRAIN: ARNOLD CHIARI II WITH HYPOPLASTIC CORPUS CALLOSUM AND STENOGYRIA; T1 (MRI)
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  BRAIN: ARNOLD CHIARI II WITH REPAIRED MYELOMENINGOCELE AND TETHERED SPINAL CORD; T1 (MRI)
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  BRAIN: ARNOLD CHIARI TYPE IV; T1 (MRI)
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  BRAIN: ARNOLD CHIARI TYPE IV; T1 (MRI)
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  BRAIN: ARNOLD CHIARI MALFORMATION II; 1/2 PCMC (MRI)
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  BRAIN: ARNOLD CHIARI MALFORMATION II, HERNIATED CEREBELLAR TONSIL; 1/2 PCMC - ARROW (MRI)
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  SPINAL CORD: ARNOLD CHIARI MALFORMATION II; 2/2 PCMC (MRI)
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  SPINAL CORD: ARNOLD CHIARI MALFORMATION II; 2/2 PCMC - ARROW (MRI)
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  BRAIN: ARNOLD CHIARI MALFORMATION; 1/3 T2 (MRI)
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  BRAIN: ARNOLD CHIARI MALFORMATION; 1/3 - ARROW T2 (MRI)
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  BRAIN: ARNOLD CHIARI MALFORMATION; 2/3 T2 (MRI)